MFRC63002R datasheet(71/118 Pages) NXP

71 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

71 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

9.7.2.6

T1ReloadHi

High byte (MSB) reload value of the Timer1.

9.7.2.7

T1ReloadLo

Low byte (LSB) reload value of the Timer1.

Table 80.

T1Control bits

Bit

Symbol

Description

T1StopRx

If set, the timer stops after receiving the first 4 bits. If cleared, the timer

is not stopped automatically.

Note: If LFO trimming is selected by T1start, this bit has no effect.

RFU

5 to 4

T1Start

00b: The timer is not started automatically

01b: The timer starts automatically at the end of the transmission

10b: Timer is used for LFO trimming without underflow (Start/Stop on

PosEdge)

11b: Timer is used for LFO trimming with underflow (Start/Stop on

PosEdge)

T1AutoRestart Set to logic 1, the timer automatically restarts its countdown from

T1ReloadValue, after the counter value has reached the value zero.

Set to logic 0 the timer decrements to zero and stops.

The bit Timer1IRq is set to logic 1 when the timer underflows.

RFU

1 to 0

T1Clk

00b: The timer input clock is 13.56 MHz

01b: The timer input clock is 211,875 kHz.

10b: The timer input clock is an underflow of Timer0

11b: The timer input clock is an underflow of Timer2

Table 81.

T0ReloadHi register (address 15h)

Bit

Symbol

T1ReloadHi

Access

rights

r/w

Table 82.

T1ReloadHi bits

Bit

Symbol

Description

7 to 0

T1ReloadHi

Defines the high byte reload value of the Timer 1. With the start event

the timer loads the value of the T1ReloadValHi and T1ReloadValLo.

Changing this register affects the Timer only at the next start event.

Table 83.

T1ReloadLo register (address 16h)

Bit

Symbol

T1ReloadLo

Access

rights

r/w

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